She read: "To our darling son, brother, uncle and friend, there are just not enough words to say how we as a family feel today.

"We miss you so much, the loss can be just too much.

"You'll be 24 on May 13 and we should be doing all crazy things with you instead we will be standing by your graveside, crying, feeling pain, but also feeling blessed that you were with us for 18 wonderful years.

The solid oak wood bench has been scribed with a 'D'

"Our lives will always be broken and filled with sadness.

"This bench is for us and anyone that just wants to sit, remember and reflect on what good times and memories we have.

"We can come here and think of you and remember how truly blessed we were to have you."

The letter also referred to his new nephew, Ezra, who was born on March 21, and whose middle name is Daniel.

Daniel Squire's family say the bench is in the "perfect location"Daniel Squire died in 2013 and would have been 24 on Monday

Mr and Mrs Squire have paid for the bench themselves via a donation to the National Trust which goes towards the maintenance and upkeep of its sites.

Rangers who secured it in the chalky cliff explained it had been made by volunteers at Scotney Castle in Kent.

The cliffs in St Margarets were frequented by the young triathlete during his training for the Bolton Iron Man endurance contest.

Tracy Squire and granddaughter Keira place family photos in the ground

Mr Squire said: "When Daniel was alive, we would frequently come up here running, from Ringwould, through this point here and back through to Kingsdown and he loved this area."

Mrs Squire said she would also visit the tranquil spot with its sweeping views of the Channel in the aftermath of her son's death.

Daniel, a former St Edmund's Catholic School pupil, was cycling from his home in Reach Close in St Margaret’s to his father’s house in Ringwould when he was struck by a van driven by Philip Sinden on September 7, 2013.